In March 2017, in which country was "world's largest artificial sun”, switched on?
Germany
The correct answer is Germany.
In March 2017, the German Aerospace Center (DLR) switched on "Synlight", then the world's largest artificial sun, at Jülich. It uses an array of 149 xenon short-arc lamps to concentrate light to about 10,000 times the intensity of natural sunlight, mainly to research solar-driven hydrogen fuel production.
China, USA and Russia have other solar/fusion projects, but the specific "largest artificial sun" activated in March 2017 was Synlight in Germany.
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